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Prescribing
•
For serial organs, maximum (near-max) dose is relevant
parameter
➢
ICRU recommends D
2 %
rather than D
Max
(D
0 %
)
➢
Overcomes problem of defining (knowing!) what volume of
the structure is important
➢
Note that D
2 %
not validated (yet); caution given !
➢
But … it is logical
➢
However, effect will depend on total volume of structure
➢
In gynae brachtherapy often use D
2 cm
3